How about if I use separate files instead? Maybe 1 file for each month?

Yes, if that's possible you could do something like this: 

my $mon_idx = 0;

for my $fname ( qw(jan.dat feb.dat mar.dat apr.dat may.dat) ) {
    
    open my $fh, "<", $fname or die "Couldn't open '$fname': $!";
    
    while (<$fh>) {
        my ($acc, $freq, $perc) = split /\t/;
        $mutperc{$acc}[$mon_idx] = $perc;
    }
    $mon_idx++;
}

for my $acc (sort keys %mutperc) {
    print $acc;
    for my $mon_idx (0..4) {
        my $perc = $mutperc{$acc}[$mon_idx];
        $perc = 0 unless defined $perc;
        print "\t$perc";
    }
    print "\n";
}

[download]

By usnig a fix index ($mon_idx) instead of pushing onto the arrays, the values would end up in the right place and you'd get undef for the months with missing values, which you can later turn into 0.

In reply to Re^3: Put multiple values as columns inside a hash by almut
in thread Put multiple values as columns inside a hash by buzzybeewhee

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